Mintylia (Nickname: Mint), an 18 years old women—appearance of a highschooler—that came from college to work at one of four major company, VOR, which stands for "Visit, Observe, Research". She can be timid at time and hates heights under certain condition. She maintain her value and refuse to go backward and only forward. Right now, her clearance tier is Dawn, a newcomer.

Eufu, an 31 years old woman who likes beer but also wants to reduce any danger for her friends and colleagues. She at first want newcomer to quit before danger ahead, but Mintylia was the first to join regardless of what comes ahead. Eufu started to respect her, as well as overprotect her sometimes ever since she herself never had mother before. She attempts to act motherly, informative, and reasonable to Mint.